Truck shut off

[Daytripper]

Exiting Rt.81 yesterday ...after going thru a rough patch of road the truck shut off...I coasted to the shoulder...noticed dash flashing "low coolant"..checked under hood , no leaks, coolant full, sensor not unplugged, wiring seems ok..no corrosion, no break in the wires...??? Think I should pick up a new sensor.. Truck started right back up but it sounded like the computer shut off the fuel as it was idling rough for a second or two(which the ecm would do if it detected a low coolant situation?) Ran truck rear of the day with no issue...any ideas?